Tsb 18 na 3552/24/2023 ONLY a good proper designed aftermarket converter can correct the cause. The shudder is from the fluid aerating and then it cannot provide the clamping pressure for the clutches and steels, and the metal HCI2000SS found is from the damaged caused by the shudder, and all will have this damage depending on how long the shudder was present. The flush is only a bandaid intended to get you past the warranty period, and then it is no longer a liability to the auto maker. The symptom is from the stock converters poor design. Now, on the shudder issue and the fluid flushes. It is their responsibility, but it does not make the dealer or the tech any additional compensation, so the "run around" is usually given. Techs are paid flat rate, so if there is a mistake they need to fix it with no pay for fixing it as they received pay for the first fix. We have seen cases of suspected TCC shudder turn out to be engine performance, tire/wheel vibration or a driveline vibration.ScatPack is correct. In some instances, shudder is fish bite, chuggle, surge or vibration. Sometimes shudder is not caused by the torque converter clutch (TCC). Any vehicle that returns with suspect shudder should be diagnosed utilizing using published diagnostics, GDS, PICO Scope or other diagnostic tools. The published labor operations will pay once per VIN as the fluid exchange has been very effective at permanently at eliminating shudder. The fluid exchange procedure has been very effective at permanently eliminating Torque Converter Shudder. Vehicles presented with suspected shudder within the published build dates should have the prescribed fluid exchange procedure performed. Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH (40 and 128 KM/H) at Steady Speed are in GM Service Information to address Torque Converter Shudder.ฤก8-NA-355 and 19-NA-121 have been updated effective Jto eliminate the diagnostics portion within the TSB's and the labor times have been updated to reflect the removal of the diagnostic procedures. TSB: 19-NA-121: 2019 Chevrolet Silverado and GMC Sierra equipped with RPO (MQE) TSB: 18-NA-355: All 8 Speed Models except 2019 Chevrolet Silverado and GMC Sierra (new body style) equipped with RPO (MQE) Not real certain what a "Fish Bite" or a "Chuggle" is though. Looks like GM is satisfied with the trans fluid change. I'd have thought the trans was the harder of the two repairs but it wasn't by a mile! They got into a conference with the GM Tech Center who directed them to replace the logic board in the seat. I have the feeling that this option was so rare for them that they were at a loss.and why I like Capital Cadillac is that they are very honest about it. This fix took days because after they replaced the seat switch, the bladders still automatically and arbitrarily pumped up. On a road trip where you are in and out lots, this aspect was a real pain. Worse still was each time you'd shut the car off, the bladders would pump up. Periodically, the switches on the sides would do nothing (usually the screen tells you which adjustment you are making) but I'd get no operation. The Recaro seat fix had to do with the seat bolsters adjustment. They said to allow 200 miles for it to take but I noticed the improvement straightaway-yay! The transmission flush seems to have stopped the shudder in its tracks and the car is fine. I had this trans TSB performed last week along with a repair of my Recaro seat logic board (mind of its own).
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